Process for rendering peat, wood-waste, and other vegetable substances suitable for the manufacture of paper-pulp.



UNTE STATES FATE 'T ETCE;

VJILIIELILE EZELLWIG, GTE

PROCESS FOR BENDERING "BEAT, VJ'OOD- WASTE, AND'OTHEB VEGETABLESUBSTANCES SUITABLE FOR THE BEANUFACTUR'E- OFPAPER-PULP.

No Drawing.

To all whom it may concern Be it known that I, lVILHnLM HELLWIG, asubject of the German Emperor, and a resident of Miinstereifel, RhenishPrussia, Germany, have invented certainnew and useful Improvements inthe Process for Bendering Peat, Wood-Taste, and other VegetableSubstances Suitable for the Manufacture of Paper-Pulp, of which thefollowing is a specification.

In order to render the fibers contained in peat, wood waste, (such asshavings, sawdust, branches and twigs), straw, bark, the leaves orneedles of the Coniferaz, dry plants and similar raw material suitablefor the manufacture of paper-pulp, the said materials have generally tobe boiled with solutions of chemicals under pressure.

Now the present invention has for its obiect to provide an improvedprocess for opening the fibers of the above mentioned materials.

The improved process consists substantially in allowing the material tobe treated to remain some considerable time in a warm solution ofchlorid of lime, dilute hydrochloric acid and potash or soda. hen thesolution has acted upon the material to a sufficient degree, which maybeascertained by taking samples and testing same, the material is removedfrom the solution and boiled with lime water. The resulting mass is thensuitable for further treatment for the manufacture of paper.

The following is one example of carrying out the improved process :--10kilograms of 90 per cent. calcined soda, (carbonate of soda that hasbeen partially de-hydrated by roasting) are dissolved in 100 liters ofboiling water. The solution is then boiled for a time, being stirred atintervals. Then 2 kilogs. of chlorid of lime made into a. paste withwater are. added to the boiling mixture. To this mixture when cool,there are slowly added 3 kilogs. of hydrochloric acid of about 20degrees B. The resulting liquor is then ready for opening the fibrousmaterials tobe treated which are placed in the said liquor and allowedto remain therein for about 24 hours. The liquor is preferably warmed.At the end of this period the fibrous materials are removed andintroduced into a vessel of boiling water to which gbout 5 per cent. ofburnt lime has been dded. The fibrous materials are boiled inSpecification of Letters Patent.

Application filed December 16, 1912.

Patented Dec. 15, 1914:.

Serial No. 738,958.

this thin lime water for about 2 hours after which the fibrous materialsare washed in clean cold water for the purpose of removing as far aspossible any free chemicals;

The resulting mass is then suitable for further treatment for themanufacture of paper.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A process for rendering peat, woodwasteand other vegetable material suitable for the manufacture of paper andthe like, consisting in steeping the raw materials in a solution of sodaand chlorid of lime, treating such solution with hydrochloric acidpreparatory to steeping the material, and washing such material aftersteeping.

2. A process for renderingpeat, woodwaste and other vegetable materialsuitable for the manufacture of paper and the like, consisting insteeping the raw materials in a solution of soda and chlorid of lime,treating such solution with hydrochloric acid preparatory to .steepingthe material boiling the steeped material in lime water, and washing thetreated material.

3. A process for rendering peat, wood waste and other vegetable materialsuitable for the manufacture of paper and the like, consisting insteeping the raw materials in a solution of 10 parts by weight ofcalcined soda and 2 parts by weight of chlorid of' lime in 100 parts byweight of water. treating such solution with 3 parts b weight of dilutehydrochloric acid, of 20 Be. density,

preparatory to steeping the materials, boil ing the steeped material inlime water contaming '5 per cent. of lime and washing the treatedmaterial.

4. A process for rendering peat, wood waste, and other vegetablematerial suitable for the manufacture of paper and the like, consistingin steeping the raw materials in a warm solution of 10 parts by weightof calcined soda, and 2 parts by weightof chlorid of lime in 100 partsby weight of water;

treating such solution with 3 parts by' weight of dilute hydrochloricacid of 20 Be. density preparatory to steeping the materials, boilingthe steeped material in lime water containing 5 per cent. of lime andwashing the treated material.

5. A process for rendering peat, wood waste and other vegetable materialsuitable for the manufacture of paper and the like, lime Watercontaining 5 per cent. of lime 10 consisting in steeping the rawmaterials for and Washing the treated material.

24 hours in a Warm solution of 10 parts by Signed at Cologne this fifthday of De- Weight off callcincied fscida, and 2 parts by ceinber 1912.

Weight 0 ch ori o ime in 100 parts by V Weight of Water, treating suchsolution with WVILHELM 3 parts bv Weight of dilute hydrochloricWitnesses:

acid of 20 B. preparatory to steeping the JACOB PLANTS,

materials, boiling the steeped material in Lewis VANDORY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of IPatents, Washington, D. G. 1

